Laughing Bear writes, "He (leasee) is also responsible for maintaining the fencing and other lease improvements which are in horrible shape."
Wizard writes, "These cattle will go where ever they want to, and the fences are in such poor shape that there really isn't any responsible barrier to their travels."
Although the lease requires that the the leasee maintain the fences, Anthony Chavez at the Barstow Field Office maintains that maintenance responsibility does not include repair of fences from vandalism.
(Notwithstanding that the vandalism to the fences is perpetrated by the other special interest group BLM has given dominance of your public lands, the OHV community.)